Book/Report

FZJ-2018-01094

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Zur Zündphase einer Tokamakentladung

Waidmann, G. (Corresponding author)FZJ*

1977
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/17026

Report No.: Juel-1467

Abstract: The ionization times and the magnetic flux requirement for the breakdown phase of a Tokamak discharge were calculated from a simplified model. The coupled continuity equations for the electron and neutral gas component were solved numerically for a homogeneous plasma. The relevant physical processes in the initial phase were expressed as a function of the reduced electric field and included into the model. The initial values and boundary conditions used were taken specifically for our toroidal experiment TEXTOR /7/ (R = 175 cm, a = 50 cm, B$_{\varphi}$ = 20 kG, I$_{p}$ = 480 kA). A breakdown delay time is caused by the presence of a closed metallic vessel. A strong dependence of the breakdown time is observed for realistic toroidal voltages. For TEXTOR bd-times $\tau_{z} \gtrsim$ 1 msec are to be expected. The temporal development of electron density and neutral gas concentration in the early discharge phase is discussed.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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Database coverage:

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